US4022040A - Method of operation and control of crown adjustment system drives on cluster mills - Google Patents

Method of operation and control of crown adjustment system drives on cluster mills Download PDF

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Publication number
US4022040A
US4022040A US05/616,582 US61658275A US4022040A US 4022040 A US4022040 A US 4022040A US 61658275 A US61658275 A US 61658275A US 4022040 A US4022040 A US 4022040A
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United States
Prior art keywords
roll gap
drives
mill
strip
synchronized
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Expired - Lifetime
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US05/616,582
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English (en)
Inventor
John W. Turley
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T Sendzimir Inc
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T Sendzimir Inc
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Publication date
Application filed by T Sendzimir Inc filed Critical T Sendzimir Inc
Priority to US05/616,582 priority Critical patent/US4022040A/en
Priority to GB49817/76A priority patent/GB1525069A/en
Priority to FR7636735A priority patent/FR2373338A1/fr
Priority to DE19772701344 priority patent/DE2701344A1/de
Application granted granted Critical
Publication of US4022040A publication Critical patent/US4022040A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/04—Lateral deviation, meandering, camber of product

Definitions

  • This invention relates to cold rolling cluster mills of the general type shown in Sendzimir U.S. Pat. Nos. 2,169,711; 2,187,250; 2,194,212 and 2,776,586.
  • the object of this invention is to provide improvements in the construction of such mills, with the objective of increasing the ability of these mills to roll strip which has a transverse taper in its thickness, or a transverse section of the same form as a section through a frustum of a wedge.
  • the present invention comprises means to operate and synchronize the several crown adjustment drives on Sendzimir cluster mills to that the operator can conveniently use these drives to set a roll gap having a tapered profile, in order to roll successfully strip having tapered cross section.
  • the invention comprises means to control automatically the operation of the synchronized taper drives in response to the behavior of the rolled strip.
  • the invention also comprises means to operate and synchronize the crown adjustment drives to produce a roll gap having a parabolic or any required profile to suit the incoming strip or to compensate for the crown of the mill itself.
  • FIG. 1 is a diagrammatic plan view of a typical crown adjustment drive system according to the prior art.
  • FIG. 2 is a diagram showing the roll gap change and therefore the required position relationships for each crown adjusting drive to be achieved when the taper drive is operating, for a mill having four saddles on each backing shaft.
  • FIG. 3 is a diagram similar to FIG. 2 but for a mill having seven saddles on each backing shaft.
  • FIG. 4 is a diagrammatic plan view of a taper drive system according to the present invention.
  • FIG. 5 is a diagrammatic plan view of a combined taper/crown drive system according to the present invention.
  • FIG. 6 is a diagrammatic cross sectional view showing the detailed construction of one of the differential units shown in FIG. 5.
  • FIG. 7 is a diagram similar to FIG. 3, but showing required position relationships to achieve a parabolic roll gap instead of a tapered roll gap.
  • FIG. 8 is a schematic showing of an automatic control system to operate the taper drive in response to the behavior of the rolled strip.
  • FIGS. 1, 4, and 5 housings, bearings and seals are omitted for clarity.
  • FIG. 1 The purpose of FIG. 1 is to show the prior art and so clarify the description of the present invention.
  • FIG. 1 which is drawn for a cluster mill having four saddles on each backing shaft, four identical hydraulic motors 1 drive four identical worms 3 through spindles 2.
  • Four identical wormwheels 4 (one for each saddle location) are each provided with a bore in which an internal screw thread is cut.
  • a roll gap change is effected in line with the saddle corresponding to said wormwheel, said roll gap being proportional to the angular rotation of said wormwheel.
  • the abscissae are distances across the strip measured to each side from the center line of the mill, and the ordinates represent roll gap change from the initial condition. If the roll gap is initially parallel (curve 1') and the angular displacements of the four wormwheels are considered to be zero at this time, then the angular displacements at the four saddles required to achieve a linear taper at the roll gap will be in proportion to the roll gap change ordinates given by curve 2'.
  • Curve 3' shows how a reverse taper is made, while still maintaining the same position relationships.
  • FIG. 3 is a curve similar to FIG. 2, but for a mill having seven saddles. It can be seen that in this case the required rotations of the seven wormwheels would be in the ratio 3:2:1:0:-1:-2:-3.
  • FIG. 4 one embodiment of the invention is diagrammed for a mill having four saddles on each backing shaft, in which the required rotations of the wormwheels are in the ratio 3:1:-1:-3.
  • taper drive motor 5 drives gears 7 and 9 via a coupling 13.
  • Gear 7 transmits the drive with a speed increase of 1.5:1 via gear 8, a spindle 11 and a worm 12 to wormwheel 1.
  • Gear 9 transmits the drive with a speed reduction of 1:2 via gear 10, a spindle 11 and a worm 12 to wormwheel 2.
  • Taper drive motor 6 drives gears 14 and 16 via a coupling 13.
  • Gear 14 transmits the drive with a speed increase of 1.5:1 via gear 15, a spindle 11 and a worm 12 to wormwheel 4.
  • Gear 16 transmits the drive with a speed reduction of 1:2 via gear 17, a spindle 11 and a worm 12 to wormwheel 3.
  • Idler gear 18 is used to synchronize taper drive motors 5 and 6 so that they both rotate at the same speed in the same direction.
  • one of the taper drive motors may be omitted as its only function is to assist the other drive motor.
  • FIG. 5 Another embodiment of the invention, for a mill having four saddles on each backing shaft, is shown in FIG. 5.
  • the combination of independent adjustment of each wormwheel (for crown control) and synchronized taper drive adjustment is achieved.
  • each crown adjustment drive motor 19 each drive one wormwheel (1, 2, 3 or 4) via a coupling 13, gears 20 and 21, a differential 22, a shaft 11 and a worm 12.
  • Each differential has two inputs, (driving the two side bevel gears) one input being the crown adjustment input gear 21, and the other input being the taper drive input gear described in connection with FIG. 4 (8, 10, 15, or 17).
  • the output shaft of each differential is driven by the differential cage and rotates at a speed equal to the algebraic sum of the speeds of the two inputs; it is directly coupled to a spindle 11 which drives an output wormwheel (1, 2, 3 or 4) via a worm 12.
  • taper drive motor 5 drives wormwheel 1 via gears 7 and 8, a differential 22, a spindle 11 and a worm 12. It also drives wormwheel 2 via gears 9 and 10, a differential 22, a spindle 11 and a worm 12.
  • Taper drive motor 6 drives wormwheel 4 via gears 14 and 15, a differential 22, a spindle 11 and a worm 12. It also drives wormwheel 3 via gears 16 and 17, a differential 22, a spindle 11 and a worm 12.
  • Taper drive motors 5 and 6 are synchronized by idler gear 18 which meshes with gears 10 and 17.
  • FIG. 6 illustrates the construction of the aforesaid differentials.
  • This construction is typical of commercially available differential units.
  • a cage 23 has two cage bevel pinions 24 rotatably mounted on ball bearings 25 located by snap rings 26.
  • the cage is keyed to drive shaft 27.
  • Two side bevel gears 28 are each rotatably mounted on shaft 27 by means of ball bearings 29 located by snap rings 30.
  • the side bevel gears are provided with cylindrical surfaces on which input drive gears, 3, 5, 8, 21, (shown in phantom) can be mounted and keyed.
  • the side bevel gears mesh with the cage bevel gears.
  • the invention can be applied to Sendzimir cluster mills having any number of supports (saddles) on each backing shaft. Note that in the case of mills having an odd number of saddles, the middle saddle lies on the mill center line and in general, it will not be driven by the taper drive system, since its required movement under taper drive is zero at all times.
  • FIGS. 2 and 3 the required position relationships are shown with a zero point at the mill center line.
  • the zero point could have been taken at any other point across the mill, for example at saddle No. 1, and the synchronizing gear ratios adjusted accordingly.
  • an advantage would be obtained because all the wormwheels would be driven in the same direction during a synchronized adjustment, so the accuracy of the synchronization would be degraded minimally by the backlash between worms and wormwheels.
  • the range of adjustment obtainable would be halved in this case, as the number of revolutions of each wormwheel for the full range of adjustment is fixed.
  • such synchronization means can be used to set, for example, a parabolic form of the roll gap, or a form to suit the profile of the incoming strip, the tapered form of roll gap clearly not being required in this case.
  • the mechanical and thermal crown of the mill itself can have a significant effect, so it is also possible to use such sychronization to produce a form of roll gap which will be a mirror image of the mill crown, thus nullifying the bad effect of the mill crown upon the shape or flatness of the rolled strip.
  • Either strip edge position detectors or differential tensiometers (the latter consisting of a load measuring device under each bearing of a deflector roll which the rolled strip passes over, and a device for comparing the load on each bearing and hence the relative tension on each edge of the strip) can be used to detect this effect, and automatic means such as electronic amplifiers and electrohydraulic servovalves or relays and solenoid valves can be used to amplify the strip position error, or differential tension error to provide a correction signal to the taper drive motors in order to bring the strip back to its correct path and so to balance the tensions in front and back edges of the strip.
  • automatic means such as electronic amplifiers and electrohydraulic servovalves or relays and solenoid valves can be used to amplify the strip position error, or differential tension error to provide a correction signal to the taper drive motors in order to bring the strip back to its correct path and so to balance the tensions in front and back edges of the strip.
  • the taper drive motors are hydraulic motors and proportional control is achieved by using an electrohydraulic servovalve to supply oil to these motors (which will be hydraulically connected in parallel if more than one motor is used). It is also possible to use on-off control by using a solenoid valve to supply oil to these motors, since the required speed of response of the system is not very high.
  • FIG. 8 A schematic diagram of a typical closed loop automatic control system to maintain equal elongation in front and back edges of strip is shown in FIG. 8.
  • a photo-electric sensor 31 is used to detect the strip edge position.
  • the electrical analog signal produced by this sensor is compared with the required or reference position signal (set by operator using potentiometer 34) by comparator 32 which gives an output signal equal to the difference between reference and measured position and which therefore represents strip edge position error.
  • This error signal is amplified and suitably delayed using controller 33, the necessary delay to achieve system stability varying with strip speed, an electrical analog signal of which is supplied to the controller from tacho-generator 35 (driven by deflector roll 36).
  • Deflector roll 36 is driven by strip 37 as it emerges from the mill 40 (shown in plan view) and passes around the deflector roll under tension.
  • the output signal from the controller is used to energize the coil of servovalve 38, which supplies hydraulic oil under pressure to drive taper drive motors 39 in such a direction as to correct the error.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US05/616,582 1975-09-25 1975-09-25 Method of operation and control of crown adjustment system drives on cluster mills Expired - Lifetime US4022040A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US05/616,582 US4022040A (en) 1975-09-25 1975-09-25 Method of operation and control of crown adjustment system drives on cluster mills
GB49817/76A GB1525069A (en) 1975-09-25 1976-11-30 Profile adjustment system in a cluster mill
FR7636735A FR2373338A1 (fr) 1975-09-25 1976-12-07 Laminoir a froid a cylindres multiples
DE19772701344 DE2701344A1 (de) 1975-09-25 1977-01-14 Vielrollen-kaltwalzwerk und verfahren zu seinem betriebe

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US05/616,582 US4022040A (en) 1975-09-25 1975-09-25 Method of operation and control of crown adjustment system drives on cluster mills
GB49817/76A GB1525069A (en) 1975-09-25 1976-11-30 Profile adjustment system in a cluster mill
FR7636735A FR2373338A1 (fr) 1975-09-25 1976-12-07 Laminoir a froid a cylindres multiples
DE19772701344 DE2701344A1 (de) 1975-09-25 1977-01-14 Vielrollen-kaltwalzwerk und verfahren zu seinem betriebe

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US4022040A true US4022040A (en) 1977-05-10

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US05/616,582 Expired - Lifetime US4022040A (en) 1975-09-25 1975-09-25 Method of operation and control of crown adjustment system drives on cluster mills

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US (1) US4022040A (en, 2012)
DE (1) DE2701344A1 (en, 2012)
FR (1) FR2373338A1 (en, 2012)
GB (1) GB1525069A (en, 2012)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286448A (en) * 1979-11-13 1981-09-01 Loewy Robertson Engineering Co. Ltd. Mill control
EP0050319A3 (en) * 1980-10-20 1983-01-19 Sumitomo Metal Industries, Ltd. Control system for superhigh pressure generation circuit
US5179851A (en) * 1990-12-14 1993-01-19 T. Sendzimir, Inc. Crown adjustment control system for cluster mills
WO1993005898A1 (de) * 1991-09-23 1993-04-01 Sundwiger Eisenhütte Maschinenfabrik Gmbh & Co. Walzenstützvorrichtung zur korrektur des walzenspaltes in einem vielwalzen-walzgerüst für bänder
US5692407A (en) * 1990-09-19 1997-12-02 Hitachi, Ltd. Shape control in a strip rolling mill of cluster type
CN114713635A (zh) * 2022-06-08 2022-07-08 太原理工大学 一种电磁感应式辊型调控的背衬辊

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2100653A (en) * 1935-09-27 1937-11-30 Gen Electric Control system
US2194212A (en) * 1935-07-16 1940-03-19 American Rolling Mill Co Tension rolling method and apparatus therefor
US2526475A (en) * 1945-03-29 1950-10-17 Revere Copper & Brass Inc Apparatus for rolling wedge sections
US3478559A (en) * 1966-05-20 1969-11-18 Natalis H Polakowski Flexible strip rolling mill
US3587263A (en) * 1968-12-10 1971-06-28 Westinghouse Electric Corp Method and apparatus for steering strip material through rolling mills
US3921425A (en) * 1974-06-13 1975-11-25 Tadeusz Sendzimir Process and apparatus for producing metal sheets of better flatness

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2194212A (en) * 1935-07-16 1940-03-19 American Rolling Mill Co Tension rolling method and apparatus therefor
US2100653A (en) * 1935-09-27 1937-11-30 Gen Electric Control system
US2526475A (en) * 1945-03-29 1950-10-17 Revere Copper & Brass Inc Apparatus for rolling wedge sections
US3478559A (en) * 1966-05-20 1969-11-18 Natalis H Polakowski Flexible strip rolling mill
US3587263A (en) * 1968-12-10 1971-06-28 Westinghouse Electric Corp Method and apparatus for steering strip material through rolling mills
US3921425A (en) * 1974-06-13 1975-11-25 Tadeusz Sendzimir Process and apparatus for producing metal sheets of better flatness

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286448A (en) * 1979-11-13 1981-09-01 Loewy Robertson Engineering Co. Ltd. Mill control
EP0050319A3 (en) * 1980-10-20 1983-01-19 Sumitomo Metal Industries, Ltd. Control system for superhigh pressure generation circuit
US5692407A (en) * 1990-09-19 1997-12-02 Hitachi, Ltd. Shape control in a strip rolling mill of cluster type
US5179851A (en) * 1990-12-14 1993-01-19 T. Sendzimir, Inc. Crown adjustment control system for cluster mills
WO1993005898A1 (de) * 1991-09-23 1993-04-01 Sundwiger Eisenhütte Maschinenfabrik Gmbh & Co. Walzenstützvorrichtung zur korrektur des walzenspaltes in einem vielwalzen-walzgerüst für bänder
CN114713635A (zh) * 2022-06-08 2022-07-08 太原理工大学 一种电磁感应式辊型调控的背衬辊
CN114713635B (zh) * 2022-06-08 2022-09-06 太原理工大学 一种电磁感应式辊型调控的背衬辊

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Publication number Publication date
DE2701344A1 (de) 1978-07-20
FR2373338B1 (en, 2012) 1982-04-30
GB1525069A (en) 1978-09-20
FR2373338A1 (fr) 1978-07-07

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